Eating breakfast at lunchtime or dinner during normal sleeping hours may seem like a minor weekend indulgence. New research suggests, however, that this type of irregular meal timing, described by scientists as “eating jet lag,” may be linked to higher cardiovascular risk in men.

A French study published in Communications Medicine found that each additional hour of eating jet lag was associated with a 14% higher risk of cardiovascular disease and a 21% higher risk of coronary heart disease among men. No similar association was observed in women.

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Why Meal Timing Matters

Weekend schedules often differ from weekday routines, with work and school timetables shifting when people eat. Over time, researchers suggest, these changes may interfere with the body’s biological rhythms.

“This study suggests the importance of regular meal-timing patterns, beyond sleep and diet quality, in cardiovascular disease prevention,” the authors wrote.

Researchers followed more than 100,000 participants for 14 years, analyzing the timing of their first and last meals on working days and weekends between 2009 and 2023.

Risk Pattern Appeared In Men

Participants were grouped according to how their meal times changed between weekdays and weekends. One group ate earlier on weekends, another maintained similar schedules, and a third ate later.

Both groups with irregular meal timing showed higher cardiovascular risk than those with stable schedules, regardless of overall diet quality. The association was observed only among men.

Researchers proposed several possible explanations. Men generally have a higher absolute risk of cardiovascular disease, while women tend to have stronger morning-oriented routines that may influence how their bodies respond to changes in meal timing.

Circadian Rhythms May Explain The Link

One possible explanation is that irregular eating disrupts the body’s circadian system, which regulates many physiological functions over a 24-hour cycle.

Light is the main signal that sets circadian rhythms, but food timing also helps synchronize peripheral clocks in organs including the liver and heart. Eating in alignment with these rhythms is generally associated with better metabolic regulation, while irregular timing may disrupt that balance.

What It Means For Prevention

The findings do not prove that irregular meal timing causes heart disease. However, they add to growing evidence that when people eat may matter nearly as much as what they eat for long-term cardiovascular health.

If confirmed in larger studies, regular meal timing could become a useful target for public health interventions aimed at reducing chronic disease risk. For individuals, employers and schools, greater consistency in daily routines may be more than a lifestyle preference and could form part of a broader strategy to protect heart health.